How do we know that the universe is about 14 billions year old? I am having a hard time understanding it, how we can measure (the age and size) of something that we are not able to grasp?
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Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.
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